Complete Set Of Flexible Instantaneous Arc Suppression Coil

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The operating principle of a bias‑magnetized arc‑suppression coil is to use an auxiliary DC excitation to magnetize the iron core, thereby varying the core’s permeability and achieving continuous adjustment of inductance. The DC‑biased arc‑suppression coil is an arc‑suppression device whose inductance can be continuously tuned; it features an all‑static internal structure with no moving parts, ensuring high operational reliability. It also boasts a rapid response time and can adjust its inductance even when subjected to high voltages.

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Intelligent Control Device

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400-0571-505

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Detailed introduction

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Product Overview

The operating principle of a bias‑magnetized arc‑suppression coil is to apply an auxiliary DC excitation to magnetize the iron core, thereby varying the core’s permeability and achieving continuous adjustment of inductance. The DC‑biased arc‑suppression coil is an arc‑suppression device with continuously adjustable inductance; it features an all‑static internal structure with no moving parts, ensuring high operational reliability. It offers rapid response and can adjust inductance even when the coil is subjected to high voltages.

Component

The complete set of a bias‑magnetic arc‑suppression coil comprises a grounding transformer, the arc‑suppression coil itself, a control system, an isolating switch, a surge arrester, current transformers, and voltage transformers.

Product model

Main Features

This device is designed for 6–66 kV neutral‑unearthed power systems. When a single‑phase-to‑ground fault occurs, it generates an inductive current that opposes the direction of the ground‑capacitance current, thereby compensating for the capacitive fault current and reducing the residual current at the fault point to below 5 A. It effectively suppresses arc‑flash overvoltages and helps prevent interphase short circuits and other faults triggered by single‑phase groundings. The device is widely applicable to various mining, petroleum, chemical, building‑materials, metallurgical industries, as well as to high‑voltage distribution networks in large and medium‑sized cities.

Key Technical Features

● Stepless continuous adjustment;
● It can be adjusted under high pressure, is a follow‑up adjustment type, and does not require pre‑adjustment of the compensation current.
● By employing dynamic regulation, the issue of series resonance overvoltage in the compensation system is fundamentally eliminated.
● No series damping resistor is required;
● Fully static compensation, with no mechanical moving parts, ensuring a long service life;
● Compact footprint; the primary equipment consists solely of a grounding transformer and an arc-suppression coil.
● Response time ≤ 200 ms.

Main Technical Parameters

● Rated voltage: 6 kV, 10 kV, 20 kV, 35 kV, 66 kV
● Rated capacity: 60 kVA to 2,500 kVA (customization available for capacities outside this range)
● Rated frequency: 50 Hz
● Capacitor current tracking sensitivity: ≤0.5 A
● Capacitor current measurement error: ≤2%
● Capacitor current measurement error: ≤2%
● Adjustment method: Stepless continuous adjustment
● Residual current during a single-phase-to-ground fault: ≤5 A
● Displacement voltage during system operation: ≤15%
● Excitation current response time: ≤20 ms
● Post‑single‑phase‑to‑ground, compensation detuning degree: <5%

Reactive Power Compensation Capacity Assessment

Natural power factor						Target Power Factor C		osφ2
Cosφ1	0.8	0.85	0.9	0.91	0.92	0.93	0.94	0.95	0.96	0.97	0.98	0.99	Unity
0.50	0.982	1.112	1.248	1.276	1.306	1.337	1.369	1.403	1.44	1.481	1.529	1.59	1.732
0.51	0.937	1.067	1.202	1.231	1.261	1.291	1.324	1.358	1.395	1.436	1.484	1.544	1.687
0.52	0.893	1.023	1.158	1.187	1.217	1.247	1.28	1.314	1.351	1.392	1.44	1.5	1.643
0.53	0.85	0.98	1.116	1.144	1.174	1.205	1.237	1.271	1.308	1.349	1.397	1.458	1.6
0.54	0.809	0.939	1.074	1.103	1.133	1.163	1.196	1.23	1.267	1.308	1.356	1.416	1.559
0.55	0.768	0.899	1.034	1.063	1.092	1.123	1.156	1.19	1.227	1.268	1.315	1.376	1.518
0.56	0.729	0.86	0.995	1.024	1.053	1.084	1.116	1.151	1.188	1.229	1.276	1.337	1.479
0.57	0.691	0.822	0.957	0.986	1.015	1.046	1.079	1.113	1.15	1.191	1.238	1.299	1.441
0.58	0.655	0.785	0.92	0.949	0.979	1.009	1.042	1.076	1.113	1.154	1.201	1.262	1.405
0.59	0.618	0.749	0.884	0.913	0.942	0.973	1.006	1.04	1077	1.118	1.165	1.226	1.368
0.60	0.583	0.714	0.849	0.878	0.907	0.938	0.97	1.005	1.042	1.083	1.13	1.191	1.333
0.61	0.549	0.679	0.815	0.843	0.873	0.904	0.936	0.97	1.007	1.048	1.096	1.157	1.299
0.62	0.515	0.646	0.781	0.81	0.839	0.87	0.903	0.937	0.974	1.015	1.062	1.123	1.265
0.63	0.483	0.613	0.748	0.777	0.807	0.837	0.87	0.904	0.941	0.982	1.03	1.09	1.233
0.64	0.451	0.581	0.716	0.745	0.775	0.805	0.838	0.872	0.909	0.95	0.998	1.058	1.201
0.65	0.419	0.549	0.685	0.714	0.743	0.774	0.806	0.84	0.877	0.919	0.966	1.027	1.169
0.66	0.388	0.519	0.654	0.683	0.712	0.743	0.775	0.81	0.847	0.888	0.935	0.996	1.138
0.67	0.358	0.488	0.624	0.652	0.682	0.713	0.745	0.779	0.816	0.857	0.905	0.966	1.108
0.68	0.328	0.459	0.594	0.623	0.652	0.683	0.715	0.75	0.787	0.828	0.875	0.936	1.078
0.69	0.299	0.429	0.565	0.593	0.623	0.654	0.686	0.72	0.757	0.798	0.846	0.907	1.049
0.70	0.27	0.4	0.536	0.565	0.594	0.625	0.657	1.247	0.729	0.77	0.817	0.878	1.02
0.71	0.242	0.372	0.508	0.536	0.566	0.597	0.629	0.663	0.7	0.741	0.789	0.849	0.992
0.72	0.214	0.344	0.48	0.508	0.538	0.569	0.601	0.635	0.672	0.713	0.761	0.821	0.964
0.73	0.186	0.316	0.452	0.481	0.51	0.541	0.573	0.608	0.645	0.686	0.733	0.794	0.936
0.74	0.159	0.289	0.425	0.453	0.483	0.514	0.546	0.58	0.617	0.658	0.706	0.766	0.909
0.75	0.132	0.262	0.398	0.426	0.456	0.487	0.519	0.553	0.59	0.631	0.679	0.739	0.882
0.76	0.105	0.235	0.371	0.4	0.429	0.46	0.492	0.526	0.563	0.605	0.652	0.713	0.855
0.77	0.079	0.209	0.344	0.373	0.403	0.433	0.466	0.5	0.537	0.578	0.626	0.686	0.829
0.78	0.052	0.183	0.318	0.347	0.376	0.407	0.439	0.474	0.511	0.552	0.599	0.66	0.802
0.79	0.026	0.156	0.292	0.32	0.35	0.381	0.413	0.447	0.484	0.525	0.573	0.634	0.776
0.80	-	0.13	0.266	0.294	0.324	0.355	0.387	0.421	0.458	0.499	0.547	0.608	0.75
0.81	-	0.104	0.24	0.268	0.298	0.329	0.361	0.395	0.432	0.473	0.521	0.581	0.724
0.82	-	0.078	0.214	0.242	0.272	0.303	0.335	0.369	0.406	0.447	0.495	0.556	0.698
0.83	-	0.052	0.188	0.216	0.246	0.277	0.309	0.343	0.38	0.421	0.469	0.53	0.672
0.84	-	0.026	0.162	0.19	0.22	0.251	0.283	0.317	0.354	0.395	0.443	0.503	0.646
0.85			0.135	0.164	0.194	0.225	0.257	0.291	0.328	0.369	0.417	0.477	0.62
0.86	-	-	0.109	0.138	0.167	0.198	0.23	0.265	0.302	0.343	0.39	0.451	0.593
0.87	One	-	0.082	0.111	0.141	0.172	0.204	0.238	0.275	0.316	0.364	0.424	0.567
0.88	-	-	0.055	0.084	0.114	0.145	0.177	0.211	0.248	0.289	0.337	0.397	0.54
0.89			0.028	0.057	0.086	0.117	0.149	0.184	0.221	0.262	0.309	0.37	0.512
0.90	-	-	-	0.029	0.058	0.089	0.121	0.156	0.193	0.234	0.281	0.342	0.484
0.91	-		-		0.03	0.06	0.093	0.127	0.164	0.205	0.253	0.313	0.456
0.92	-	-	One			0.031	0.063	0.097	0.134	0.175	0.223	0.284	0.426
0.93		-	-			-	0.032	0.067	0.104	0.145	0.192	0.253	0.395
0.94	-	-	-		-	-	-	0.034	0.071	0.112	0.16	0.22	0.363
0.95							One		0.037	0.078	0.126	0.186	0.329
0.96	-	-	-	-	-		-	-	-	0.041	0.089	0.149	0.292
0.97		-		-		-	One				0.048	0.108	0.251
0.98	-	-	-	-	-	-	-				-	0.061	0.203
0.99	-		One			-							0.142

Application
Factory load: 500 kW Power factor before improvement: Cos φ1 = 0.6 Target power factor after improvement: Cos φ2 = 0.95

Required compensation capacity = 500 × 1.005 (obtained from the table above)

=500 kVAR

none

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